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(a) If there were u girls, there were 3u boys since 1/4 of students were girls. 

Given

3u – u = 2u = 120

u = 60

There were 4u students, so there were 240 students.

Number of teacher = 2 * 240/8 = 60

There were 60 teachers in the camp.

(b) There were in total 240 + 60 = 300 students and teachers.

There were 180 boys.

Fraction of boys at the camp = 180/300 = 3/5

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